Studies on cephalometric prediction for surgical correction of mandibular deformities. Part I. Lateral cephalometric changes on three-dimensional mandibular movement.:Part I. Lateral cephalometric changes on three-dimensional mandibular movement

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The experiment on the three-dimensional movement of specimens of small-, medium-, and large-typed mandible was made, and the following results were obtained.<BR>1. The positional changes of the lower first incisor, point B, Pogonion, and Menton on the lateral head films were to be within only 1 mm, even if the occlusal plane of the specimens were given the rotary movement less than 6 degrees in the frontal plane or less than 9 degrees in the horizontal plane in two dimensions.<BR>2. It was considered under an additional clinical study that the rotary movement of the mandibular occlusal plane in the frontal plane and horizontal plane, individually in the two dimensions or in the more complex three dimensions, had little effect upon the positional changes of the lower first incisor, point B, Pogonion, and Menton on the lateral head films on general cases which were indicative of sagittal splitting osteotomy of the mandibular ramus.
社団法人日本口腔外科学会の論文